NERVE-ENDINGS IN MUSCLE 



225 



of an onion. A medullated nerve -fiber enters at the bottom, and 

 soon loses its medullary sheath. The free axis -cylinder terminates 

 in a rounded or bulb -like extremity, surrounded by a homogenous 

 substance, the inner bulb. 



The special form of nerve -endings, called taste-buds, have 

 already been described (page 149). 



NERVE -ENDINGS IN MUSCLE 



The plexuses of non - medullated nerves supplying non- striated 

 muscle have often been referred to (pages 154 and 160). From 

 these plexuses minute fibrillae extend among the muscle -cells. 

 Their exact mode of termination has not been definitely determined. 



FIG. 145. NERVE-ENDING IN STRIATED MUSCLE-AFTER KUHNE. 



The medullated nerves supplying striated muscle form an intra- 

 muscular plexus. Bundles of nerve -fibers start from this plexus, 

 one nerve -fiber going to each muscle -fiber. The medullary sheath 

 is lost. The axis -cylinder breaks up into twisted fibrillae, with 

 bulbous ends. These constitute the end -plate, which probably lies 

 below the sarcolemma, and is imbedded in nucleated protoplasm, 

 the sole -plate. 



